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Parametric modeling method of rail profile shape based on NURBS adjustable weight factor

A technology of parametric modeling and rail section, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problem that the optimal rail section grinding profile does not have global optimality, and the rail section profile has not been established Problems such as parametric model and inability to adjust the grinding profile of the rail section can achieve good engineering application value, solve the problem of low optimization accuracy and improve the grinding quality

Inactive Publication Date: 2016-03-23
XIJING UNIV
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Problems solved by technology

However, in the process of optimizing the grinding profile of the rail, no parametric model of the profile of the rail section has been established, and the continuous and precise adjustment of the grinding profile of the rail section cannot be realized. The optimal profile determined is based on the The optimal profile determined by experience leads to the fact that the obtained optimal rail section grinding profile does not have global optimality, which is not conducive to ensuring the quality of rail grinding

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  • Parametric modeling method of rail profile shape based on NURBS adjustable weight factor
  • Parametric modeling method of rail profile shape based on NURBS adjustable weight factor
  • Parametric modeling method of rail profile shape based on NURBS adjustable weight factor

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Embodiment Construction

[0035] In order to make the purpose, technical solution and advantages of the present invention clearer and clearer, the specific content of the present invention will be further described below in conjunction with the accompanying drawings, but the specific embodiments of the present invention are not limited thereto.

[0036] Such as figure 1 As shown, a parametric modeling method of rail section profile based on NURBS adjustable weight factor, including the following steps:

[0037] 1) Utilize CAD software or a rail profile scanner to obtain the coordinate values ​​of the rail cross-section profile data points, which are used as the model point coordinates of the NURBS curve, and the model value point coordinates are two-dimensional coordinates, including x-axis and y-axis coordinates value;

[0038]2) Take the center point of the rail top of the profile profile of the rail as the origin, the horizontal direction as the x-axis, and the vertical direction as the y-axis to c...

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Abstract

The invention provides a parametric modeling method of a rail profile shape based on an NURBS adjustable weight factor. The method comprises the following steps: firstly, obtaining a profile shape data point coordinate value, then constructing a data point coordinate file, designing a calculation flow of using a data point to reversely calculate an NURBS curve control point, and pre-setting an adjustable NURBS weight factor file; developing a parametric graphical user interface for a rail profile shape curve, updating a data point coordinate file, performing reverse calculation and obtaining a control point coordinate file of the rail profile shape, updating the adjustable NURBS weight factor file, calculating and displaying a new rail profile parametric profile shape, outputting a parametric model and conserving a data file. The parametric modeling method of the rail profile shape based on the NURBS adjustable weight factor provided by the invention uses the local convex hull property and the affine transformation characteristic of the NURBS curve to realize the parametric modeling of the rail profile shape by adjusting the weight factor, and the locally continuous and accurate adjustment of the rail profile shape can be achieved.

Description

technical field [0001] The invention belongs to the technical field of optimizing the grinding profile of a mechanical engineering rail, and in particular relates to a parametric modeling method for rail section profile based on NURBS adjustable weight factors. technical background [0002] With the continuous increase in the operating mileage of high-speed railways in my country, after long-term operation of high-speed railway lines, the rails of railway lines will have obvious wear, cracks, crushing and other diseases. It is necessary to polish the profile of the rail section within a certain period to ensure Improve the safety of rail vehicles, improve the stability of vehicles, and extend the service life of rails to a certain extent. Before the rail grinding construction, according to the actual situation of the worn line, optimizing the grinding profile of the rail section is of great significance for improving the grinding quality and ensuring the running stability and...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 解欢曾威刘越
Owner XIJING UNIV
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